Connected: An Internet Encyclopedia
RFC 793 - SEND Call

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### SEND Call

        CLOSED STATE (i.e., TCB does not exist)

          If the user does not have access to such a connection, then return
          "error:  connection illegal for this process".

          Otherwise, return "error:  connection does not exist".

        LISTEN STATE

          If the foreign socket is specified, then change the connection
          from passive to active, select an ISS.  Send a SYN segment, set
          SND.UNA to ISS, SND.NXT to ISS+1.  Enter SYN-SENT state.  Data
          associated with SEND may be sent with SYN segment or queued for
          transmission after entering ESTABLISHED state.  The urgent bit if
          requested in the command must be sent with the data segments sent
          as a result of this command.  If there is no room to queue the
          request, respond with "error:  insufficient resources".  If
          Foreign socket was not specified, then return "error:  foreign
          socket unspecified".

        SYN-SENT STATE
        SYN-RECEIVED STATE

          Queue the data for transmission after entering ESTABLISHED state.
          If no space to queue, respond with "error:  insufficient
          resources".

        ESTABLISHED STATE
        CLOSE-WAIT STATE

          Segmentize the buffer and send it with a piggybacked
          acknowledgment (acknowledgment value = RCV.NXT).  If there is
          insufficient space to remember this buffer, simply return "error:
          insufficient resources".

          If the urgent flag is set, then SND.UP <- SND.NXT-1 and set the
          urgent pointer in the outgoing segments.

        FIN-WAIT-1 STATE
        FIN-WAIT-2 STATE
        CLOSING STATE
        LAST-ACK STATE
        TIME-WAIT STATE

          Return "error:  connection closing" and do not service request.

Next: RECEIVE Call

Connected: An Internet Encyclopedia
RFC 793 - SEND Call